FIG. 3.

Multiple alignment of the deduced amino acid sequences of the pdeA and dgc genes of A. xylinum showing the conserved GGDEF (regions I to IV) and EAL (regions V to VIII) domains. Residues identical in all six sequences are shaded in black and indicated in the consensus line; residues identical in five of six sequences are shaded in gray. In the region shown, the DGC and PDEA isoenzyme sets have 23 to 29% identity, compared to 77 to 89% identity among the PDEA sequences and 47% identity among the DGC sequences. Putative Q-linker regions are delimited by asterisks.